The SAIC 3 feet 40W LED tri-proof lights are designed for ambient lighting even in harsh environmental conditions, such as wet basement, parking lot, warehouse, etc. There are two types of covers, with milky cover having transmittance 82%, and transparent cover with transmittance 92%, the light fixtures output high quality light without glare. Three installation methods as ceiling mounting, suspension mounting and wall built-up mounting can be better meeting your various requirements.